掺氢比对氢-甲醇发动机稀薄燃烧及排放影响  

Effect of H_(2)Ratio on Combustion and Emissions of a H_(2)/Methanol Engine During Lean Burn Operation

作　　者：姚勇 马毅[2,3] 王坤 刘明[2,3] 谢思幽 YAO Yong;MA Yi;WANG Kun;LIU Ming;XIE Siyou(Ministry of Industry and Information Technology Equipment Industry Development Center,Beijing 100846,China;China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China;Chongqing Key Laboratory of Vehicle Emission and Energy Saving,Chongqing 401122,China)

机构地区：[1]工业和信息化部装备工业发展中心,北京100846 [2]中国汽车工程研究院股份有限公司,重庆401122 [3]车辆排放与节能重庆市重点实验室,重庆401122

出　　处：《汽车工程学报》2023年第1期46-53,共8页Chinese Journal of Automotive Engineering

基　　金：国家重点研发计划(2022YFE0100100)。

摘　　要：为探究掺氢比对氢-甲醇发动机稀薄燃烧性能的影响,在一台1.8 L涡轮增压缸内直喷汽油机(GDI)改装的氢-甲醇发动机上,开展了不同燃空当量比和不同掺氢比条件下的甲醇发动机掺氢燃烧和排放试验研究。结果表明,在稀燃条件下,增大掺氢比能提高发动机缸内最高燃烧压力及放热率峰值,且燃烧相位提前,燃烧持续期缩短。在稀燃情况下适当掺氢有助于改善循环变动,混合气越稀改善效果越好,但随燃空比和掺氢量增大时,循环变动却有恶化的趋势。当燃空当量比大于0.71时,增大掺氢比能改善HC排放;当燃空当量比大于0.83时,掺氢能改善NO_(x)排放,但CO排放恶化;当燃空当量比小于0.83时,增大掺氢比导致NO_(x)排放恶化但CO排放降低。In order to study the influence of hydrogen mixing ratio on the lean combustion performance of hydrogen-methanol engines,experiments were carried out on a hydrogen-methanol engine modified by a 1.8L turbocharged gasoline direct injection(GDI)engine,considering different fuel-air equivalence ratios and hydrogen mixing ratios.The hydrogen-mixed combustion and emissions of the methanol engine were focused.The test results show that under lean-burn conditions,as the hydrogen ratio increases,the maximum combustion pressure and the peak heat release rate in the engine cylinder increase,the combustion phase is advanced and the combustion duration is shortened.The leaner combustion condition with the proper amount of hydrogen improves even more the cycle fluctuation.However,when the fuel-air ratio and the amount of hydrogen increase,the cycle fluctuation tends to deteriorate.For the fuel-air equivalence ratio greater than 0.71,increasing the hydrogen mixing ratio can improve HC emissions.For the fuel-air equivalence ratio greater than 0.83,hydrogen admixture improves NO_(x)emissions;however,increasing the hydrogen mixing ratio deteriorates CO emissions.For the ratio less than 0.83,increasing the hydrogen mixing ratio leads to the deterioration of NO_(x)emissions and the decrease of CO emissions.

关 键 词：氢-甲醇发动机 掺氢比 稀薄燃烧 循环变动 排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]